Method of uniting metals.



WITNESSES W. G. GREY & W. GRIFFITH.

METHOD OF UNITING METALS.

APPLICATION FILED FEB.23, 1910.

Patented Nov. 22, 1910.

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WILLIAM Gr. GREY AND WILLIAM GRIFFITH, 0F PITTSBURG, PENNSYLVANIA.

METHOD OF UNITING METALS.

I the harder metal to a cleaning and other preparatory treatment,applymg the softer metal, bringing the two metals to a heat, and thenuniting by pressure, as will be hereinafter more fully described.

We will now describe our invention so that others skilled in the art towhich it appertains may understand and practice the same, referring tothe accompanying draw- .ings in which we have shown our inventionapplied to the preparation of ingots, billets, or bars. We do not,however, desire to limit ourselves to the preparation of any particularshape. For convenience, however, 1n describing our invention we willhereinafter refer to the iron or steel shape as the harder body ofmetal.

1 Figure l is a perspective view of an ingot,

billet, or bar of hard metal, having a body of softer metal unitedthereto, in accordance with our invention; and Figs. 2, 3 and 4 aresimilar views showing modified forms of shapes to be hereinafter morefully referred to. I

' In carrying out our invention, the body of harder metal 2 is firstsubjected to a cleaning or preparatory bath to remove thescale and oxidfrom the surfacevor surfaces to which the softer metal is to be united.This cleaning bath may be the ordinary acid solution used for thispurpose. After the above treatment, the body 2 may be given a coating ofalkali solution, such as chromate 'potasslum or chromate sodium, so asto prevent'ready oxidation of the surface or surfaces thus cleaned.

' After the body 2 of harder 'metal has received the above treatment, itis placed in a solution of metallic salt, sulfuric acid, and alum. Theparticular salt which we prefer to use is sulfate of copper. Thissolution is the metals thus united are heated to a temperature slightlybelow the fusing point of the softer metal, in which state the twometals are welded by subjecting to suitable pressure device, such asrolls or presses.

The metals having been welded, may then be rolled or otherwise worked asdesired.

Any suitable manner of attaching the body of-softcr metal to the'body ofharder metal may be employed. In Fig. 1 the body 2 of harder metal isshown as having the recess4 in which is placed the body of softerprepared and proportioned preferably as metal 3, which is to be unitedthereto in the manner above described. In this construction the edges orflanges 5 formed by this depressed surface serve, when pressed againstthe edge of the body of softer metal 3 to rigidly hold the body 3 inposition on the shape 2.

In Fig. 2 the body of softer metal is shown in the form of a shell orcontinuous coating 6. It will be seen that the shell 6 may be readilyplaced in position on the bar 2 preparatory to being united therewith. Afurther form or shape of the body 2 of harder metal is shown in Figs. 3and 4. Fig. 3

shows the body of softer metal in the form of the core 7 while inthelatter, Fig. 4, is

shown both a core 7 and an outside shell or coating 6. These lattershapes, that is, the shapes shown'in Figs. 2, 3 and 4, are suchas may beemployed in the production of wire rods and the like.

The advantages of our invention will be a preciated by those skilled inthe art. The addition of the, alum to the solution of metallic saltconduces to a rapid incremental homogeneous deposit of the copper on thebody adapted to receive it;this homogene ousness of the coatin resultingin a perfect union of the meta s when subsequently united in the mannerabove described,

Having thus described our invention,

What we claim and desire to secure by Letters Patent is:

1. The herein-described method of uniting relativel hard metals, such asiron or steel with re atively soft metals such as copper, brass, bronze,aluminum or other metal or alloy; w ich .consistsjn first cleaning theharder metal, subjecting it to a solution-of metallic'salt and alum; aplying the softer metal to the treated su'r ace of the harder metal,bringing he metals to a heat, and then uniting by ressure.

2. The hereinescribed method of uniting relatively hard metals,- such asiron or steel with relatively soft metals such as copper,

brass, bronze, aluminum, or other' metal or alloy, which consists in"first cleamng the harder metal, applying to its surface a coating ofalkali solution, subjecting it to a solution of metallic salt and alum,applying the 20 M. ARTHUR KELLER, MARY A. BARTH.

